Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed26cc1802f3b54b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 09:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c721c3441ececd4eb5b3c673e3f836a1 SHA-1: b6ffac81b306668e3d5efe424297c4e1082f045c SHA-256: ed26cc1802f3b54b6d49376d616b55a706169ae551636973c50e8c00a708c908
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://dyneco.kr/userData/board/file/43090204760.pdf In PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/bokowagajakenabari.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109010622044891.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139409d2b76e---nobakaxis.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/wirarajibawotom.pdfIn PDF document text
    • https://luminex.pl/upload/file/lixuwovifiwetaw.pdfIn PDF document text
    • http://e-menu.hu/editor_up/20033620882.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/56084671661.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/53911158348.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/caea7uj4r33umno7bej6559e2r/ropakod.pdfIn PDF document text
    • http://telecycling.info/files/file/34961575681.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/webekigowimalemulem.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/belatajidegaguveviwu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/0536a6c5787a877c963eb218deb90ed4/lelajozerurodoguweti.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/55574411343.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/degozawato.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/lulaneneziruwi.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/f2e30117d14c5f59d07a76baf8d13910/62674939508.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/mapolavavuki.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/kadavubijafifokobiwo.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/jixiduron.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/96400470368.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/93304102751.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/95522083153.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/gesonoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+fork+the+witch+and+the+worm+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 10716 bytes
SHA-256: c6dc9956fad5a8f4b6d74e4794617df57bf87fded726c82a0707e7db551eb9df
font_01_sfnt_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 18944 bytes
SHA-256: 8f1583c5d53adb1032a6da10cb704b1a9727c623cec78e079e7b8942a2554c28
font_02_sfnt_off00011fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1